very random

i am bored.

"ku ku bird" hangs around my mouth these few days. i have no idea how it started.

i think i'll start doing squats.

evon is back today ya ya ya ya??? haha. can't wait to hear her stories.

you dont have to read further more. really. i am so tired that is will not be possible for me to write notes. so i'll type notes.


communication modes: simplex, half duplex, full duplex.


protocol: a set of rules that control how devices on a network communicate. It defines the format, timing, sequencing and error control in data communication. e.g, HTTP, FTP, SMTP, POP3, TCP, IP, DNS, CSMA/CD

1 Byte = 8 bits
1 Mb = 1024 X 1024 X 8
time needed = total no. of bits / speed
= total no. of bits / 10 X 10^6


computer networks provide effective communications and sharing of resources esp in the following areas. list any software or hardware needed and explain how you can set up a simple network to achieve these

a) File Sharing : install a file server in the network so that users can store the files to be shared on a network drive. this allows other users to be able to read/write files stored in the server.

b) High speed internet access for remote (home) users : install an ADSL router on the network. subscribe to an ADSL line from ISP (Internet Service Provider). This allows all users to log on to the network to have internet access.

c) Email : install a file server in the network. this will allow users to communicate through email.


2 factors that will affect the selection of cables for any network applications
BANDWIDTH; amount of data transmitted in a cable; optic fiber, coaxial cable, UTP cable, wireless transmission.
ATTENUATION; loss of power as signal travels along the media.
INTERFERENCE;
MECHNICAL ATTRIBUTES;


advantages and disadvantages of optical fiber cable
+: high bandwidth, suitable for long distance application;
: not prompt to electro-magnetic interference
: not easy to tap into

-: high cost material
: needs trained skill to install
: less flexible than copper/coaxial cable


now computer i also cannot tahan already. ku ku bird. go bath first.